Proba-3 mission and the ASPIICS coronagraph
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1 Proba-3 mission and the ASPIICS coronagraph Marek Stęślicki 1 and the Proba-3 SWT 1 Space Research Centre Polish Academy of Sciences
2 General objectives The Proba-3 project aims: To develop and demonstrate in-orbit the formation flying (FF) techniques and associated technologies, To develop and validate the engineering approach, ground verification tools and facilities required by formation flying, To provide scientific data using a giant coronagraph payload for the observation of the sun corona
3 Proba 3 mission objectives Proba-3 is a mission for in-orbit demonstration (IOD) of breakthrough concepts approaches. It addresses the objectives of the Agency s IOD strategy, i.e. the demonstration of: Technology and products, e.g. metrologies, new GNSS receivers, new GNSS ASIC, new CMOS detectors, new gyros, etc. Techniques, for research or services, e.g.: precise formation flying, with incapacitated target, in elliptical orbit, GNSS navigation beyond LEO coronagraphy for science, for in-orbit operations, etc. Mission architecture and system concepts, Industrial capabilities: from new companies and/or in new Member States
4 Imaging observations of the solar corona Between the low corona (typically observed by EUV imagers) and the high corona (typically observed by externally occulted coronagraphs), there is a region where observations are difficult to make. An externally occulted coronagraph allows for a good straylight rejection. However, the inner edge of its field of view is limited by the telescope length. 1.4 R SOHO/EIT The Gap SOHO/LASCO C2
5 How to close The Gap? Ground-based coronagraphs (straylight) Internally occulted space-borne coronagraphs (straylight) Wide field-of-view EUV imagers (very long exposure times) Total solar eclipses (are rare and last only several minutes)
6 The PROBA-3 mission An artificial total eclipse created using two spacecraft in flight formation. The formation flying is maintained over 6 hours in every 20-hour orbit: around a factor 100 improvement in the duration of uninterrupted observations in comparison with a total eclipse. A technological challenge: the distance between the spacecraft is 150 m, and the accuracy of their positioning should be around a few millimeters!
7 ASPIICS characteristics 6 channels: 1 white light, 3 polarized light, 1 narrow-band filter centered at the Fe XIV line at 5303 Å, 1 narrow-band filter centered at the He I D3 line at 5876 Å. 2048x2048 pixels 2.8 arc sec per pixel Outer edge of the field of view: 2.99 R 4.20 R in the corners 60 s nominal cadence 2 s using a quarter of the field of view ASPIICS will cover The Gap between the typical fields of view of EUV imagers and externally occulted coronagraphs! Outer edge of the ASPIICS field of view (3 R ) Inner edge of the ASPIICS field of view (1.08 R )
8 outer edge of the SDO/AIA field of view: 1.27 R The position of the inner Edge of the ASPIICS field of view allows for a significant overlap with SDO/AIA. inner edge of the ASPIICS field of view: 1.08 R
9 ASPIICS scientific objectives The top-level scientific objectives of ASPIICS are: Understanding the physical processes that govern the quiescent solar corona by answering the following questions: What is the nature of the solar corona on different scales? What processes contribute to the heating of the corona and what is the role of waves? What processes contribute to the solar wind acceleration? 2. Understanding the physical processes that lead to CMEs and determine space weather by answering the following questions: What is the nature of the coronal structures that form the CME? How do CMEs erupt and accelerate in the low corona? What is the connection between CMEs and active processes close to the solar surface? Where and how can a CME drive a shock in the low corona?
10 Coronal magnetic field The magnetic field often plays a dominant role in the structuring and dynamics of plasma in the solar corona However, the coronal magnetic field cannot be routinely measured at the moment. Instead, it is extrapolated from photospheric magnetograms. The extrapolated field is strongly model dependent. The extrapolated field cannot always reproduce the complex magnetic configuration of the solar corona. ASPIICS field of view ASPIICS will answer questions about the structuring and dynamics of the solar corona on different scales, as well as constrain coronal magnetic field models. MHD model of the coronal magnetic field
11 Mission overview The Proba-3 mission consists of two spacecraft, the Coronagraph and the Occulter spacecraft, flying in a close proximity (about 150m with accuracy of a few mm) The giant coronagraph is implemented by one satellite occulting the sun and the other satellite flying a telescope Occulter SpaceCraft OSC Coronagraph SpaceCraft CSC
12 Mission overview Launch 2019 Occulter 200 kg 120 Mb/orbit Coronagraph 340 kg, 9 Gb/orbit S-band Redu (BE)
13 Proba-3 Orbit PROBA-3 orbit is the result of a complex trade-off that takes into account many contrasting requirements: Requirement Need of low gravity gradient environment (to exercise FF demonstration without large fuel penalty) Limit radiation Accessibility by low cost launcher via direct launch Visibility from Redu as main tracking station Natural de-orbit within 25 years (to comply with debris avoidance regulations) Preference High altitude High inclination, appropriate Argument of Perigee (~180 deg) Low altitude, low inclination, appropriate AoP High inclination Low altitude, appropriate RAAN Best compromise is High Elliptical orbit of intermediate inclination with tuned AoP and RAAN to match requirements
14 Orbit characteristics Perigee altitude decays naturally after ~2.5 yrs due to Lunar-solar perturbation Parameter Value Perigee height 600 km Apogee height km Semi-major axis km Eccentricity Inclination 59 RAAN 84 AoP 188 Orbital period 19h38m
15 Routine orbit Coronagraphy around apogee: Spacecraft are in fine formation (for 6 h around the apogee) 0.5h after the 6h, the formation is broken by prop maneuver (DTM1) Outside the apogee arc: Spacecraft are in free drift (safe) configuration Relative GPS nav. around perigee. Formation acquisition maneuvers (DTM2) and instrument preparation take place on the ascending arc Data downlink takes place in any point of the orbit depending on GS visibility (in average 6-h per orbit)
16 Formation Flying PRECISE FORMATION FLYING The relative lateral and longitudinal positions are controlled The absolute attitude is controlled The «line of sight» of the formation is controlled A virtual large and solid structure is built and oriented Target vector oriented towards Sun Required Position control Lateral: 5 mm 150 m ISD) Longitudinal: 1.5 mm 150 m ISD)
17 Spacecrafts Mass (wet): 231 kg Dimensions: envelop: 1.42m x 1m x 1.42m ADPMS (combined power & computer) Power: solar array 200W Ah Li-ion battery Propulsion: 12x2 10-mN cold gas TTC&Comms: S-band FF technologies: Inter satellite Link (ISL), Optical metrology including a camera Vision based sensor and corner-cubes, OPSE LEDs AOCS: Reaction wheels, star tracker, sun sensor, GPS, gyros Mass (wet): 283 kg (incl. margins) Dimensions: envelop: 1.65m x 1.1m x.1.95m ADPMS (combined power & computer) Power: Solar array 300 W Ah Li-ion battery Propulsion: 2x8 1-N monopropellant TT&Comms: S-band Coronagraph instrument FF technologies: Inter satellite Link, optical metrologies including a coarse lateral sensor, a fine lateral sensor AOCS: reaction wheels, star tracker, sun sensor, GPS, gyros
18 Coronagraph Spacecraft Power handling capabilities up to 300 W Single side-deployable Solar Array to avoid penumbra from Occulter disk 8X2 1-N monopropellant thrusters for 6 DoF control of the SC
19 Occulter Spacecraft 12X2 10-mN cold gas thrusters for 6 DoF control of the SC All SC body shall be behind the disk to avoid straylight to the Coronograph Fixed Solar Array Disk is black-painted on the Coronagraph side and white painted on the Sun side
20 Slide on scattering from nitrogen cloud Worst case nitrogen density around OSC: Assuming density is molecules per cm 3 everywhere, and considering Rayleigh scattering, estimate of flux entering ASPIICS ~ (normalised to flux from direct Sun) Negligible compared to other source of straylight
21 Shadow Position Sensor 8 photo-diodes mounted close to the instrument aperture, along 2 concentric circles A lateral or longitudinal position error of the formation means a displacement of the diodes within the umbra and penumbra regions created by the occulter disk The variation of light intensity on the diodes is processed to estimate the displacement with great accuracy
22 Occulter Position Sensor 3 LEDS mounted on the occulter disk Imaged by the instrument during Corona observation Downlinked to ground with the rest of the image to perform post processing and verify the lateral position of the occulter with respect to the Coronagraph OPSE images on the detector
23 COB Design
24 Optical Design
25 Optical Design - IO The IO is designed to block the diffraction produced by the edge of the EO. Coating on the O2 Lens, with a central hole so that images of the OPSE CI can acquired.
26 Filters Filters in the FWA: WBF [ nm] 3 WBF + pola NBF Fe XIV at nm NBF He I D3 at nm
27 CMOS Detector
28 Coronal brightness in the FOV 3+ orders of magnitude of total (K+F) brightness
29 Multiple exposures Need several exposures for sufficient S/N over the FOV
30 Multiple exposures Short exposure Medium exposure Long exposure Three exposures reconstructed into one unpolarized WL image
31 Image tiling Tile each image into blocks of pixels Compress and store each tile individually Send down a subset of the tiles in each image (based on quality )
32 Proba-3 orbit: Earth in the FOV Moon in or close to the FOV: not an issue as radiometrically equivalent to the Corona Earth: there are ~27 consecutive days when, during the Coronagraphy period, the Earth can have an view angle ε < 5 deg
33 Summary ASPIICS is a unique solar coronagraph project. It will cover The Gap between the low corona (typically observed by EUV imagers) and the high corona (typically observed by externally occulted coronagraphs). ASPIICS observations will be crucial for solving several outstanding problems in solar physics: structure of the magnetized solar corona, sources of the slow solar wind, onset and early acceleration of CMEs, origin of coronal shocks waves. ASPIICS data will serve as an example of will test formation flying technologies that can be used by future ESA missions. Several formation flying missions were proposed to ESA in the past: DynaMICCS (a comprehensive solar observatory), XEUS (X-ray observations of galaxies and their supermassive black holes), SolmeX (measurements of the magnetic field in the solar corona), FLIP3 (high-energy solar physics).
34 Thank you!
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